One vertex per element, one color per generator, with an edge from x to x·s.
(1,2,5,8)(3,6,11,9)(4,12,13,7)(10,15,16,14)(17,18,24,27)(19,28,23,25)(20,22,21,26)(29,31,30,32)(33,34,38,42)(35,41,37,39)(36,44,46,40)(43,47,45,48)(1,2)(3,6)(4,7)(5,8)(9,11)(10,14)(12,13)(15,16)(17,19,24,23)(18,25,27,28)(20,30,21,29)(22,31,26,32)(33,35,38,37)(34,39,42,41)(36,45,46,43)(40,48,44,47)(17,20,24,21)(18,26,27,22)(19,29,23,30)(25,31,28,32)(33,34)(35,39)(36,40)(37,41)(38,42)(43,47)(44,46)(45,48)(1,2)(3,9)(4,7)(5,8)(6,11)(10,15)(12,13)(14,16)(17,21,24,20)(18,22,27,26)(19,30,23,29)(25,32,28,31)(33,36,38,46)(34,40,42,44)(35,43,37,45)(39,47,41,48)(1,3)(2,6)(4,10)(5,11)(7,14)(8,9)(12,15)(13,16)(17,22)(18,20)(19,31)(21,27)(23,32)(24,26)(25,30)(28,29)(33,34)(35,39)(36,44)(37,41)(38,42)(40,46)(43,48)(45,47) involution — undirected(1,4,5,13)(2,7,8,12)(3,10,11,16)(6,14,9,15)(17,23,24,19)(18,25,27,28)(20,30,21,29)(22,32,26,31)(33,37,38,35)(34,41,42,39)(36,45,46,43)(40,48,44,47)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.